MANUFACTURING METHOD OF THE PERIODIC PROFILE THIN-WALL SHELLS FROM ALUMINIUM ALLOYS Russian patent published in 2017 - IPC B21D22/14 

FIELD: metallurgy.

SUBSTANCE: pipes are cut into measuring blanks, machined on the outer and inner surfaces to obtain the wall thickness equal to 3÷6 minimum wall thicknesses of the finished shell. Further perform the rotary reduction of the blanks at two-or three-roller pressing-rolled machines per several passes with the blank constant contact to the holder by the deforming rollers of the working surface different profile with the radius at the top, selected depending on the blank wall thickness. Use the rollers, one of which is displaced in the direction of its axial displacement by 0.3÷0.5 of the blank wall thickness. At that install the gap between the profile top and the holder of the first roller in the direction of the axial movement at each pass, exceeding the gap between the profile top and the holder of the subsequent rollers. In the end perform the machining with the thread cutting at the end bosses.

EFFECT: increase of the shells geometric dimensions accuracy and the processed surfaces quality.

4 cl, 1 tbl, 4 dwg